Add "clib\__init__.py" in “python\opencc”

[forfudan]

System description: Windows x64. Python version: 3.9.

Running "python setup.py build" results in the following error:

copying python\opencc\__init__.py -> build\lib.win-amd64-3.9\opencc
package directory 'python\opencc\clib' does not exist.

This is because the package 'opencc.clib' is imported in 'python\opencc_init_.py' (Line 6) before the function "build_libopencc()" in 'setup.py' creates the directory "python\opencc\clib" (Line 83).

By adding the file "clib_init_.py" in the directory “python\opencc”, the command "python setup.py build" can successfully build the files.

I do not know whether this is also related to the issue that the wheel files cannot be created on PyPI for Windows for the recent versions (>1.1.1)

[forfudan]

https://github.com/BYVoid/OpenCC/issues/651#issue-1082239837 https://github.com/BYVoid/OpenCC/issues/593